One World Trade Center
Also known as Freedom Tower, the 104-story One World Trade Center rises a symbolic 1,776 feet into the New York skyline. Though it tapers octagonally as it rises, the building's square base perfectly fits the footprint of the original twin tower.
Designed by architectural firm Skidmore, Owings & Merrill - who also designed the Burj Khalifa - One World is the tallest building in the Western Hemisphere and the sixth tallest building in the world.
The One World Observatory - located on the 100th, 101st and 102nd floors - doesn’t stop bringing the 'wow'; from the moment you enter the building, to its elevator rides, all the way up to the top of New York City.
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The app was easy to use. I would definitely use the advance ticketing when I expect high volume visitors.